I don't know, FF vs SF, if the FF is really significantly stronger from a shock breakage standpoint, but you get better reliability with the supported shaft and extra bearings, and redundancy since you can drive out with a broken axle with a FF
I have been thinking of a way to adapt (with a plate adaptor of some sort) the front wheel spindle onto the end of the SF rear axle housing, that would give you a full floater with the same bearings, spindles, hubs, rotors etc on all 4 corners
Just have to weld some tabs onto the adaptor plate for brake calipers (probably mini truck or supra if u need a park brake) and have some custom axle shafts made
I don't know if it is practical or not, the Semi-Float housing might have to be reinforced at the ends, I just figured it could be a good economical solution since most of the parts can be sourced from a junk-yard
Most of the LC suppliers sell full-floater housings, It may be cheaper and easier to do the OEM FF axle, shipping is a killer though